[vsnet-alert 25449] Re: ASASSN-21cf

[Kojiguchi Naoto]

     According to the ASASSN data, this object seems slightly fading. However, keep in mind that ASASSN data is strongly contaminated by the neighbor.
If this fading is true, this object might be AM CVn-type object because the feature that the plateau phase of this object is only for 3 or 4 days is similar to the feature of WZ Sge-type superoutburst in AM CVn star.

     Unfortunately, due to the altitude of this object, I cannot confirm the fading of this object.

ASASSN Sky Patrol (strongly contaminated by a nearby star):
https://asas-sn.osu.edu/sky-patrol/coordinate/c5246364-aa0f-404e-b536-606eeb610162
https://asas-sn.osu.edu/sky-patrol/coordinate/cc9910ee-04bf-497c-a37a-5d9ce5724a6a

On 2021/02/24 12:35, Taichi Kato wrote:
> ASASSN-21cf
>
>     Bright, large-amplitude outburst.
>
> ASASSN-21cf 	--- 	------- 	9:18:56.99 	-52:41:16.4 	2021-02-22.83 	13.16 	SDSS 	DSS 	VIZIER 	------- 	CV candidate, in TESS, matches to GAIA DR2 G=19.4, g>18.1 on 2021-02-19.95, g=14.8 on 2021-02-20.78, g=13.5 on 2021-02-22.83, g=13.5 on 2021-02-23.34.
>
> ASASSN-21cf 20210219.95 <181g ASN
> ASASSN-21cf 20210220.78 148g ASN
> ASASSN-21cf 20210222.83 135g ASN
> ASASSN-21cf 20210223.34 135g ASN
>
> Gaia:
> 091856.979 -524116.51 (2000.0) Gaia_DR2_5311633853662674816 plx=1.604(0.341) dismod=9.0 pmra=-12.914(0.659) pmdec=-0.545(0.626) G=19.410 BP=19.289 RP=18.645
> 091856.978 -524116.51 (2000.0) Gaia_EDR3_5311633853662674816 plx=1.556(0.253) dismod=9.0 pmra=-12.401(0.168) pmdec=-2.275(0.232) G=19.363 BP=19.444 RP=18.722